If you want the truth I don't see the point fermenting a already good feed/ feed mix and possibly depleting nutrition that they need OR increasing ones they don't need as much of. The other thing I don't see is fermenting feed that is going to be fed to a animal that already ferments its own feed.
Now when these people talk about how great fermented feed is for poultry and they talk about all the "studies" do they talk about the side affects, like that some poultry carry a genetic defect that gives there eggs a fishy smell when there feed is overly fermented?
i.e. when you ferment the feed than the chicken re-ferments the feed in there digestive track.
How about there are some depilation of some vitamins when feed/ foods are fermented?
i.e. vitamin B12 is reduced in some feed ingredients / foods like dairy products when it is fermented.
As for your chickens gobbling it up eating less and showing signs of better health.
Gobbling up there feed just means there hungry not that it is any better for them.
Eating less like I said before, just means that the feed is higher in caloric energy than before. Chickens eat to fill there caloric need, not to fill there stomach, because something is better tasting or better for them.
Showing signs of better health? What signs are you looking at, feathers, skin color, how about proper body weight or the birds production?